hero: make the portals real recesses and land the facade on Z 0

The portal detail shot failed for a modelling reason, not a camera reason: the
doors were 0.1 m panels on a solid plinth, so they read as shading. The plinth is
now four piers plus a lintel band, with a 1.2 m reveal, stone jambs and lintels
standing 0.10 m proud and three mullions per opening. review-06 frames them from
8 m at eye height.

Two defects fixed while doing it: the jamb boxes hung 0.15 m below the pavement,
so the facade imported with min Z -15 cm; and a rebuild run against a read-only
.blend silently skipped the save, which is why screenshots kept showing the old
geometry.

Art/blender/hero/hero-facade-2026-11-07.json

@@ -28,30 +28,39 @@
       ],
       "evidence": "measured frontage x assumption depth x measured height, inset behind the cornice"
     },
-    {
-      "object": "Hero_Stylobate",
-      "dims_m": [
-        25.75,
-        2.4,
-        1.45
-      ],
-      "evidence": "assumption: pedestal height"
-    },
     {
       "object": "Hero_Column_x6",
       "dims_m": [
         0.95,
         0.95,
-        9.25
+        7.45
       ],
       "evidence": "6 columns at 4.96 m centres (sibling notes x measured frontage)"
     },
+    {
+      "object": "Hero_Architrave",
+      "dims_m": [
+        25.75,
+        1.65,
+        0.84
+      ],
+      "evidence": "assumption: stacked entablature bands"
+    },
+    {
+      "object": "Hero_Cornice",
+      "dims_m": [
+        25.75,
+        1.75,
+        0.36
+      ],
+      "evidence": "assumption: projecting cornice line"
+    },
     {
       "object": "Hero_Entablature",
       "dims_m": [
         25.75,
         1.5,
-        2.2
+        3.4
       ],
       "evidence": "assumption: entablature depth"
     },
@@ -60,7 +69,7 @@
       "dims_m": [
         25.75,
         1.2,
-        1.6
+        2.2
       ],
       "evidence": "assumption: parapet carries the motto band"
     },
@@ -82,6 +91,15 @@
       ],
       "evidence": "photographs: two stone discs beside the motto"
     },
+    {
+      "object": "Hero_Stylobate",
+      "dims_m": [
+        25.75,
+        2.4,
+        1.45
+      ],
+      "evidence": "assumption: pedestal height; four piers and a lintel band leave three recesses"
+    },
     {
       "object": "Hero_PortalFlight_1",
       "dims_m": [